Pub Date : 2024-11-14DOI: 10.1016/j.jcis.2024.11.087
Guoqing Chen, Pengyang Li, Chaoyuan Xu, Miaomiao Zhao, Zhaozhao Yang, Jian Sun, Bo Wang
In this work, four types of protic ionic liquids were prepared for use as pure water additives to investigate the effect of anionic alkyl chains on the tribological and drilling performance of a titanium alloy. Copper block immersion tests and electrochemical tests were conducted to compare their corrosion resistance. The results indicate that the ionic liquid containing OH and CC in the anionic alkyl chain led to stronger adsorption onto the metal substrate, providing excellent tribological performance and the highest corrosion inhibition rate (η = 98.45 %). According to density functional theory, wear scar surface analysis, and molecular dynamics simulation, the low energy gap of the anion (ΔE = 0.033 Ha) indicated that it exhibited higher reactivity. Thus, it was more susceptible to frictional chemical reactions with the metal substrate under the action of frictional heat during shearing, ultimately forming a friction film with a thickness of 20-97 nm. The ionic liquid demonstrated good wetting properties in a drilling test, enabling its effective penetration into the gaps between the drill bit and the workpiece to achieve lubrication and cooling effects. Thus, the axial force and drilling temperature were significantly reduced. Additionally, biotoxicity tests indicated that the ionic liquid is an environmentally friendly substance.
{"title":"Influence of anionic alkyl chain on the tribological properties of titanium alloy under water lubrication: Experimental analysis and molecular dynamics simulations.","authors":"Guoqing Chen, Pengyang Li, Chaoyuan Xu, Miaomiao Zhao, Zhaozhao Yang, Jian Sun, Bo Wang","doi":"10.1016/j.jcis.2024.11.087","DOIUrl":"https://doi.org/10.1016/j.jcis.2024.11.087","url":null,"abstract":"<p><p>In this work, four types of protic ionic liquids were prepared for use as pure water additives to investigate the effect of anionic alkyl chains on the tribological and drilling performance of a titanium alloy. Copper block immersion tests and electrochemical tests were conducted to compare their corrosion resistance. The results indicate that the ionic liquid containing OH and CC in the anionic alkyl chain led to stronger adsorption onto the metal substrate, providing excellent tribological performance and the highest corrosion inhibition rate (η = 98.45 %). According to density functional theory, wear scar surface analysis, and molecular dynamics simulation, the low energy gap of the anion (ΔE = 0.033 Ha) indicated that it exhibited higher reactivity. Thus, it was more susceptible to frictional chemical reactions with the metal substrate under the action of frictional heat during shearing, ultimately forming a friction film with a thickness of 20-97 nm. The ionic liquid demonstrated good wetting properties in a drilling test, enabling its effective penetration into the gaps between the drill bit and the workpiece to achieve lubrication and cooling effects. Thus, the axial force and drilling temperature were significantly reduced. Additionally, biotoxicity tests indicated that the ionic liquid is an environmentally friendly substance.</p>","PeriodicalId":351,"journal":{"name":"Journal of Colloid and Interface Science","volume":"680 Pt B","pages":"105-123"},"PeriodicalIF":9.4,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142674869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-14DOI: 10.1016/j.jcis.2024.11.073
Rundong Ma , Han Tian , Xu Yu , Xiangzhi Cui , Xinmei Hou , Shengli An
Hydrogen oxidation reaction (HOR) as the anode reaction in proton exchange membrane fuel cell, usually suffers from the high loading of platinum (Pt) and subsequent CO poisoning especially by using industrial crude hydrogen as fuel. In this work, we propose a directional electron transfer route from Pt to MoO2-x in the macroporous structure to significantly enhance the HOR activity as well as the CO tolerance, which is constructed by interface engineering and defect strategy to anchor highly dispersed Pt nanoparticles onto the three-dimensional MoO2-x-C framework. The optimized 2Pt-MoO2-x-C with 1.02 wt% Pt demonstrates higher HOR peak current density (3.57 mA cm−2) and nearly 25 times higher mass activity than 20 wt% Pt/C. The excellent HOR performance is attributed to the synergistic effect between Pt and MoO2-x species, in which the charge transfer from Pt to MoO2-x improves H2 adsorption ability of Pt and accelerates the activation of H2 due to the reduced hydrogen binding energy of MoO2-x caused by Pt-O construction, leading to the release of H* thereby the enhancement of HOR activity. The construction of three-dimensional macroporous structure enhances the HOR dynamics by promoting the conductivity, mass transfer and the exposure of active sites. Moreover, the formed Mo-OH in Pt-MoO2-x-C can effectively react with CO species to remove the CO poisoning of Pt, endowing the excellent CO tolerance.
氢氧化反应（HOR）作为质子交换膜燃料电池中的阳极反应，通常会受到铂（Pt）负载过高以及随后一氧化碳中毒的影响，尤其是在使用工业粗氢作为燃料时。在这项工作中，我们提出了一条从铂到大孔结构中的 MoO2-x 的定向电子转移路线，通过界面工程和缺陷策略将高度分散的铂纳米粒子锚定在三维 MoO2-x-C 框架上，从而显著提高了氢氧根活性和对 CO 的耐受性。优化后的 2Pt-MoO2-x-C 与 20 wt% Pt/C 相比，铂含量为 1.02 wt%，具有更高的氢氧峰值电流密度（3.57 mA cm-2）和近 25 倍的质量活性。Pt 与 MoO2-x 之间的电荷转移提高了 Pt 对 H2 的吸附能力，同时由于 Pt-O 构建降低了 MoO2-x 的氢结合能，加速了 H2 的活化，导致 H* 的释放，从而提高了 HOR 活性。三维大孔结构的构建促进了传导、传质和活性位点的暴露，从而增强了 HOR 的活性。此外，Pt-MoO2-x-C 中形成的 Mo-OH 能有效地与 CO 物种发生反应，消除 CO 对铂的毒害，从而赋予铂优异的 CO 耐受性。
{"title":"Construction of directional electron transfer from Pt to MoO2-x in macroporous structure for efficient hydrogen oxidation","authors":"Rundong Ma , Han Tian , Xu Yu , Xiangzhi Cui , Xinmei Hou , Shengli An","doi":"10.1016/j.jcis.2024.11.073","DOIUrl":"10.1016/j.jcis.2024.11.073","url":null,"abstract":"<div><div>Hydrogen oxidation reaction (HOR) as the anode reaction in proton exchange membrane fuel cell, usually suffers from the high loading of platinum (Pt) and subsequent CO poisoning especially by using industrial crude hydrogen as fuel. In this work, we propose a directional electron transfer route from Pt to MoO<sub>2-</sub><em><sub>x</sub></em> in the macroporous structure to significantly enhance the HOR activity as well as the CO tolerance, which is constructed by interface engineering and defect strategy to anchor highly dispersed Pt nanoparticles onto the three-dimensional MoO<sub>2-</sub><em><sub>x</sub></em>-C framework. The optimized 2Pt-MoO<sub>2-</sub><em><sub>x</sub></em>-C with 1.02 wt% Pt demonstrates higher HOR peak current density (3.57 mA cm<sup>−2</sup>) and nearly 25 times higher mass activity than 20 wt% Pt/C. The excellent HOR performance is attributed to the synergistic effect between Pt and MoO<sub>2-</sub><em><sub>x</sub></em> species, in which the charge transfer from Pt to MoO<sub>2-</sub><em><sub>x</sub></em> improves H<sub>2</sub> adsorption ability of Pt and accelerates the activation of H<sub>2</sub> due to the reduced hydrogen binding energy of MoO<sub>2-</sub><em><sub>x</sub></em> caused by Pt-O construction, leading to the release of H* thereby the enhancement of HOR activity. The construction of three-dimensional macroporous structure enhances the HOR dynamics by promoting the conductivity, mass transfer and the exposure of active sites. Moreover, the formed Mo-OH in Pt-MoO<sub>2-</sub><em><sub>x</sub></em>-C can effectively react with CO species to remove the CO poisoning of Pt, endowing the excellent CO tolerance.</div></div>","PeriodicalId":351,"journal":{"name":"Journal of Colloid and Interface Science","volume":"680 ","pages":"Pages 1-10"},"PeriodicalIF":9.4,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142643654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-14DOI: 10.1016/j.jcis.2024.11.088
Yongxian Liu , Bo Tang , Zaixing Wang , Yayao Jiao , Qingqing Hou , Zhangting Dang , Xiufu Hua , Liping Wei , Lingling Wang , Renbo Wei
High performance film capacitor has attracted widespread attention due to their increasing applications in electronic devices. However, the insufficient dielectric properties of dielectrics in capacitors severely restrict their practical application. In this work, the dielectric performances of polyarylene ether nitrile (PEN) are effectively enhanced by the synthesizing and employing of carboxylated PEN (CPEN) modified one-dimensional (1D) strontium barium titanate nanorod (BSTNR) (CPEN@BSTNR), as well as applying of hot stretching technique. CPEN@BSTNR is prepared via the synthesizing of BSTNR, modifying with γ-Aminopropyl triethoxysilane (KH550), and grafting by CPEN. Deriving from the 1D structure of BSTNR and the peripheral modification by CPEN, compatibility of CPEN@BSTNR in PEN has been significantly improved. Moreover, CPEN@BSTNR orients in the polymer matrix attributing to the hot stretching. Consequently, the hot stretched 16 wt% CPEN@BSTNR/PEN film exhibits an increased dielectric constant of 17.30 and maintained a breakdown strength of 204.1 kV/mm. As a result, this stretched composite film demonstrates an energy density up to 3.19 J/cm3, with a 300 % improvement over pure PEN. This enhanced dielectric properties of PEN presents a promising avenue for the fabrication of high performance film capacitors.
{"title":"Enhanced dielectric performances of strontium barium titanate nanorod composites via improved interfacial compatibility","authors":"Yongxian Liu , Bo Tang , Zaixing Wang , Yayao Jiao , Qingqing Hou , Zhangting Dang , Xiufu Hua , Liping Wei , Lingling Wang , Renbo Wei","doi":"10.1016/j.jcis.2024.11.088","DOIUrl":"10.1016/j.jcis.2024.11.088","url":null,"abstract":"<div><div>High performance film capacitor has attracted widespread attention due to their increasing applications in electronic devices. However, the insufficient dielectric properties of dielectrics in capacitors severely restrict their practical application. In this work, the dielectric performances of polyarylene ether nitrile (PEN) are effectively enhanced by the synthesizing and employing of carboxylated PEN (CPEN) modified one-dimensional (1D) strontium barium titanate nanorod (BSTNR) (CPEN@BSTNR), as well as applying of hot stretching technique. CPEN@BSTNR is prepared via the synthesizing of BSTNR, modifying with γ-Aminopropyl triethoxysilane (KH550), and grafting by CPEN. Deriving from the 1D structure of BSTNR and the peripheral modification by CPEN, compatibility of CPEN@BSTNR in PEN has been significantly improved. Moreover, CPEN@BSTNR orients in the polymer matrix attributing to the hot stretching. Consequently, the hot stretched 16 wt% CPEN@BSTNR/PEN film exhibits an increased dielectric constant of 17.30 and maintained a breakdown strength of 204.1 kV/mm. As a result, this stretched composite film demonstrates an energy density up to 3.19 J/cm<sup>3</sup>, with a 300 % improvement over pure PEN. This enhanced dielectric properties of PEN presents a promising avenue for the fabrication of high performance film capacitors.</div></div>","PeriodicalId":351,"journal":{"name":"Journal of Colloid and Interface Science","volume":"680 ","pages":"Pages 85-95"},"PeriodicalIF":9.4,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142645956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-13DOI: 10.1016/j.jcis.2024.11.072
Yujia He , Xuan Yang , Mingyuan Jiang , Fuguang Liu , Jinming Zhang , Huiying Li , Liang Cui , Jiangtao Xu , Xuqiang Ji , Jingquan Liu
To replace precious metals and reduce production costs for large-scale hydrogen production, developing stable, high-performance transition metal electrocatalysts that can be used in a wide range of environments is desirable yet challenging. Herein, a self-supported hybrid catalyst (NiFeCrSx/NF) with high electrocatalytic activity was designed and constructed using conductive nickel foam as a substrate via manipulation of the cation doping ratio of transition metal compounds. Due to the strong coupling synergy between the metal sulfides NiS2, Fe9S11, and Cr2S3, as well as their interaction with the conductive nickel foam (NF), the energy barrier for catalytic reactions is reduced, and the charge transfer rate is enhanced. This significantly improves the hydrogen evolution reaction (HER) performance of NiFeCrSx/NF, achieving a current density of 10 mA cm−2 with an overpotential of just 66 mV. Furthermore, doping with chromium generates different valence states of Cr during the catalytic process, which can synergize with the high-valent Fe and Ni, promoting the formation of oxygen vacancies and enriching the active sites for the oxygen evolution reaction (OER). Consequently, at a current density of 10 mA cm−2 in 1.0 M KOH, the overpotential for OER is only 223 mV for NiFeCrSx/NF. Additionally, the in situ grown of self-supporting nanoflower structure on NiFe-LDH not only provides a large catalytic surface area but also facilitates electrolyte penetration during the catalytic process, endowing NiFeCrSx/NF with high long-term stability. When used as a bifunctional catalyst for overall water splitting, the NiFeCrSx/NF||NiFeCrSx/NF electrolyzer requires only 1.29 V to deliver a current density of 10 mA cm−2. Simultaneously, Cr doping protects the Fe sites by maintaining stable valence states, ensuring high performance and stability of NiFeCrSx/NF, even when it is utilized for seawater splitting. This strategy offers novel concepts for creating catalysts based on non-precious metals that can be utilized in various application scenarios.
为了取代贵金属并降低大规模制氢的生产成本，开发可在多种环境中使用的稳定、高性能过渡金属电催化剂是非常理想的，但也是极具挑战性的。在此，通过操纵过渡金属化合物的阳离子掺杂比例，设计并构建了一种以导电泡沫镍为基底的具有高电催化活性的自支撑混合催化剂（NiFeCrSx/NF）。由于金属硫化物 NiS2、Fe9S11 和 Cr2S3 之间的强耦合协同作用，以及它们与导电泡沫镍（NF）之间的相互作用，降低了催化反应的能量势垒，提高了电荷转移速率。这大大提高了 NiFeCrSx/NF 的氢进化反应（HER）性能，使其电流密度达到 10 mA cm-2，过电位仅为 66 mV。此外，在催化过程中，铬的掺杂会产生不同价态的铬，与高价的铁和镍协同作用，促进氧空位的形成，丰富氧进化反应（OER）的活性位点。因此，在 1.0 M KOH 中，当电流密度为 10 mA cm-2 时，NiFeCrSx/NF 的氧进化反应过电位仅为 223 mV。此外，NiFe-LDH 上原位生长的自支撑纳米花结构不仅提供了较大的催化表面积，还有利于催化过程中电解质的渗透，从而使 NiFeCrSx/NF 具有较高的长期稳定性。当用作整体水分离的双功能催化剂时，NiFeCrSx/NF||NiFeCrSx/NF 电解槽只需要 1.29 V 的电压就能提供 10 mA cm-2 的电流密度。同时，铬的掺杂通过保持稳定的价态来保护铁的位点，从而确保了 NiFeCrSx/NF 的高性能和稳定性，即使将其用于海水分离也是如此。这种策略为创造基于非贵金属的催化剂提供了新的概念，这种催化剂可用于各种应用场合。
{"title":"Cr-doped NiFe sulfides nanoplate array: Highly efficient and robust bifunctional electrocatalyst for the overall water splitting and seawater electrolysis","authors":"Yujia He , Xuan Yang , Mingyuan Jiang , Fuguang Liu , Jinming Zhang , Huiying Li , Liang Cui , Jiangtao Xu , Xuqiang Ji , Jingquan Liu","doi":"10.1016/j.jcis.2024.11.072","DOIUrl":"10.1016/j.jcis.2024.11.072","url":null,"abstract":"<div><div>To replace precious metals and reduce production costs for large-scale hydrogen production, developing stable, high-performance transition metal electrocatalysts that can be used in a wide range of environments is desirable yet challenging. Herein, a self-supported hybrid catalyst (NiFeCrS<sub>x</sub>/NF) with high electrocatalytic activity was designed and constructed using conductive nickel foam as a substrate via manipulation of the cation doping ratio of transition metal compounds. Due to the strong coupling synergy between the metal sulfides NiS<sub>2</sub>, Fe<sub>9</sub>S<sub>11</sub>, and Cr<sub>2</sub>S<sub>3</sub>, as well as their interaction with the conductive nickel foam (NF), the energy barrier for catalytic reactions is reduced, and the charge transfer rate is enhanced. This significantly improves the hydrogen evolution reaction (HER) performance of NiFeCrS<sub>x</sub>/NF, achieving a current density of 10 mA cm<sup>−2</sup> with an overpotential of just 66 mV. Furthermore, doping with chromium generates different valence states of Cr during the catalytic process, which can synergize with the high-valent Fe and Ni, promoting the formation of oxygen vacancies and enriching the active sites for the oxygen evolution reaction (OER). Consequently, at a current density of 10 mA cm<sup>−2</sup> in 1.0 M KOH, the overpotential for OER is only 223 mV for NiFeCrS<sub>x</sub>/NF. Additionally, the in situ grown of self-supporting nanoflower structure on NiFe-LDH not only provides a large catalytic surface area but also facilitates electrolyte penetration during the catalytic process, endowing NiFeCrS<sub>x</sub>/NF with high long-term stability. When used as a bifunctional catalyst for overall water splitting, the NiFeCrS<sub>x</sub>/NF||NiFeCrS<sub>x</sub>/NF electrolyzer requires only 1.29 V to deliver a current density of 10 mA cm<sup>−2</sup>. Simultaneously, Cr doping protects the Fe sites by maintaining stable valence states, ensuring high performance and stability of NiFeCrS<sub>x</sub>/NF, even when it is utilized for seawater splitting. This strategy offers novel concepts for creating catalysts based on non-precious metals that can be utilized in various application scenarios.</div></div>","PeriodicalId":351,"journal":{"name":"Journal of Colloid and Interface Science","volume":"680 ","pages":"Pages 1079-1089"},"PeriodicalIF":9.4,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142646702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-13DOI: 10.1016/j.jcis.2024.11.081
Jianrong Li , Shengbo Yuan , Xueling Zhang , Fuming Chen , Yang Yang , Jian Kang , Yan He , Jinlong Han , Xiaoman Li , Yongqing Yang , Min Luo
The solar-driven photoelectrochemical desalination (SD-PED) technology, as a new emerging desalination technique, has been developed and attracted the increasing attention. However, practical application remains hampered by several constraints, including the rapid deterioration of photocurrent, and the long-term stability of system. In this research, MOF-derived nitrogen-doped carbon@Co3O4/BVO (Co3O4@NC/BVO) heterostructured photoanode was design for efficient and durable solar driven redox desalination. It exhibits an initial photocurrent of 2.40 mA/cm2 and a desalination rate of 69.01 μg/(cm2·min) in the zero-bias state using the light as the driving force, without consuming electrical energy. Furthermore, the solar energy consumption of the photoanode is 0.187 μmol/J. The salt removal rate fluctuates within 1.36 μg/(cm2·min) throughout five cycles without any substantial decrease. Photo-luminescence, EIS and Mott-Schottky analysis are also performed to investigate interface reaction, charge separation and transfer mechanism between photoanode and electrolyte. The analysis of the charge-transfer paths on the heterojunction interface is conducted through in situ irradiation XPS. Further analysis of the generation and separation of •OH and h+ in the Co3O4@NC/BVO photoanode using electron paramagnetic resonance (EPR) showed that Co3O4@NC as an efficient hole transfer layer can effectively promote the separation and transfer of photo-generated electrons and holes. The excellent desalination performance is attributed to the synergistic effect of electron transfer in the Co3O4@NC/BVO heterojunction and hole transport in the Co3O4@NC efficient hole transport layer. This work is significant for the development of solar redox flow desalination.
{"title":"Enhanced photoelectric desalination of Co3O4@NC/BiVO4 photoanode via in-situ construction of hole transport layer","authors":"Jianrong Li , Shengbo Yuan , Xueling Zhang , Fuming Chen , Yang Yang , Jian Kang , Yan He , Jinlong Han , Xiaoman Li , Yongqing Yang , Min Luo","doi":"10.1016/j.jcis.2024.11.081","DOIUrl":"10.1016/j.jcis.2024.11.081","url":null,"abstract":"<div><div>The solar-driven photoelectrochemical desalination (SD-PED) technology, as a new emerging desalination technique, has been developed and attracted the increasing attention. However, practical application remains hampered by several constraints, including the rapid deterioration of photocurrent, and the long-term stability of system. In this research, MOF-derived nitrogen-doped carbon@Co<sub>3</sub>O<sub>4</sub>/BVO (Co<sub>3</sub>O<sub>4</sub>@NC/BVO) heterostructured photoanode was design for efficient and durable solar driven redox desalination. It exhibits an initial photocurrent of 2.40 mA/cm<sup>2</sup> and a desalination rate of 69.01 μg/(cm<sup>2</sup>·min) in the zero-bias state using the light as the driving force, without consuming electrical energy. Furthermore, the solar energy consumption of the photoanode is 0.187 μmol/J. The salt removal rate fluctuates within 1.36 μg/(cm<sup>2</sup>·min) throughout five cycles without any substantial decrease. Photo-luminescence, EIS and Mott-Schottky analysis are also performed to investigate interface reaction, charge separation and transfer mechanism between photoanode and electrolyte. The analysis of the charge-transfer paths on the heterojunction interface is conducted through in situ irradiation XPS. Further analysis of the generation and separation of •OH and h<sup>+</sup> in the Co<sub>3</sub>O<sub>4</sub>@NC/BVO photoanode using electron paramagnetic resonance (EPR) showed that Co<sub>3</sub>O<sub>4</sub>@NC as an efficient hole transfer layer can effectively promote the separation and transfer of photo-generated electrons and holes. The excellent desalination performance is attributed to the synergistic effect of electron transfer in the Co<sub>3</sub>O<sub>4</sub>@NC/BVO heterojunction and hole transport in the Co<sub>3</sub>O<sub>4</sub>@NC efficient hole transport layer. This work is significant for the development of solar redox flow desalination.</div></div>","PeriodicalId":351,"journal":{"name":"Journal of Colloid and Interface Science","volume":"680 ","pages":"Pages 11-23"},"PeriodicalIF":9.4,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142645958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Recently, photocatalytic technology has been widely used as a sustainable method to address environmental pollution issues. Herein, BiOCl/Bi-MOF (BOC/Bi-MOF) based semiconductor photocatalysts with S-scheme heterojunction were fabricated by an in situ growth method, and the photocatalytic activity of the materials was explored for CO2 reduction and pollutant degradation. As confirmed by density functional theory calculations and physiochemical characterizations, the established S-scheme heterojunction confers enhanced carrier separation efficiency and retention of redox capability to the BOC/Bi-MOF. Through an improved combination of charge separation and surface reactions, the prepared BOC/Bi-MOF efficiently reduces CO2 solely to CO. The heterojunction as catalyst is more durable and effective than any of its single component. The CO evolution rate of the optimized composite catalyst was 7.66 and 33.10 times of those of BiOCl and Bi-MOF, respectively. In addition, BOC/Bi-MOF exhibits a high efficiency in the photocatalytic degradation of the pollutant rhodamine B (RhB) in aqueous environments, and the pollutant was completely removed within 20 min. Due to the generation of interfacial potential differences, the internal electric field (IEF) generation at heterogeneous interfaces facilitates the separation and transfer of photogenic charges. This work demonstrated a practical and effective route for in situ growth of S-scheme heterojunctions with high efficiencies in CO2 reduction and RhB degradation.
近年来，光催化技术作为一种解决环境污染问题的可持续方法得到了广泛应用。本文采用原位生长法制备了基于生物OCl/Bi-MOF（BOC/Bi-MOF）的S型异质结半导体光催化剂，并探讨了该材料在还原二氧化碳和降解污染物方面的光催化活性。密度泛函理论计算和物理化学表征证实，所建立的 S 型异质结提高了 BOC/Bi-MOF 的载流子分离效率，并保留了其氧化还原能力。通过改进电荷分离和表面反应的组合，制备的 BOC/Bi-MOF 能有效地将 CO2 还原成 CO。作为催化剂的异质结比任何单一成分都更持久有效。优化后的复合催化剂的 CO 演化率分别是 BiOCl 和 Bi-MOF 的 7.66 倍和 33.10 倍。此外，BOC/Bi-MOF 在水环境中光催化降解污染物罗丹明 B（RhB）的效率很高，在 20 分钟内就能完全去除污染物。由于界面电位差的产生，异质界面上产生的内电场（IEF）促进了光生电荷的分离和转移。这项工作为原位生长 S 型异质结提供了一条实用而有效的途径，可实现高效的二氧化碳还原和 RhB 降解。
{"title":"In situ construction of S-scheme heterojunctions between BiOCl and Bi-MOF for enhanced photocatalytic CO2 reduction and pollutant degradation","authors":"Haolan Shi, Mengjiao Xu, Changyu Leng, Lili Ai, Luxiang Wang, Hong Fan, Shumin Wu","doi":"10.1016/j.jcis.2024.11.077","DOIUrl":"10.1016/j.jcis.2024.11.077","url":null,"abstract":"<div><div>Recently, photocatalytic technology has been widely used as a sustainable method to address environmental pollution issues. Herein, BiOCl/Bi-MOF (BOC/Bi-MOF) based semiconductor photocatalysts with S-scheme heterojunction were fabricated by an <em>in situ</em> growth method, and the photocatalytic activity of the materials was explored for CO<sub>2</sub> reduction and pollutant degradation. As confirmed by density functional theory calculations and physiochemical characterizations, the established S-scheme heterojunction confers enhanced carrier separation efficiency and retention of redox capability to the BOC/Bi-MOF. Through an improved combination of charge separation and surface reactions, the prepared BOC/Bi-MOF efficiently reduces CO<sub>2</sub> solely to CO. The heterojunction as catalyst is more durable and effective than any of its single component. The CO evolution rate of the optimized composite catalyst was 7.66 and 33.10 times of those of BiOCl and Bi-MOF, respectively. In addition, BOC/Bi-MOF exhibits a high efficiency in the photocatalytic degradation of the pollutant rhodamine B (RhB) in aqueous environments, and the pollutant was completely removed within 20 min. Due to the generation of interfacial potential differences, the internal electric field (IEF) generation at heterogeneous interfaces facilitates the separation and transfer of photogenic charges. This work demonstrated a practical and effective route for <em>in situ</em> growth of S-scheme heterojunctions with high efficiencies in CO<sub>2</sub> reduction and RhB degradation.</div></div>","PeriodicalId":351,"journal":{"name":"Journal of Colloid and Interface Science","volume":"680 ","pages":"Pages 1067-1078"},"PeriodicalIF":9.4,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142646703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-13DOI: 10.1016/j.jcis.2024.11.076
Qihang Wang , Wenyang Huang , Jilin Wang , Fei Long , Zhengyi Fu , Jingjing Xie , Zhaoyong Zou
Amorphous phases hold great promise in diverse applications and are widely used by organisms as precursors to produce biominerals with complex morphologies and excellent properties. However, the stabilization and crystallization mechanisms of amorphous phases are not fully understood, especially in the presence of additives. Here, using amorphous calcium carbonate (ACC) as the model system, we systematically investigate the crystallization pathways of amorphous phases in the presence of poly(Aspartic acid) (pAsp) with various chain lengths. Results show that pure ACC transforms into a mixture of calcite and vaterite via the typical dissolution–recrystallization mechanism and 3 % of Asp monomer exhibits negligible effect. However, pAsp with a chain length of only 10 strongly inhibits the aggregation-induced formation of vaterite spheres while slightly delaying the growth of calcite via classical ion-by-ion attachment, thus kinetically favoring the formation of calcite. Moreover, the inhibition effect of calcite growth from solution ions becomes more prominent with the increase of pAsp chain length or concentration, which significantly improves the stability of the amorphous phase and leads to crystallization of spherical or elongated calcite via the nonclassical particle attachment mechanism after pseudomorphic transformation of ACC into vaterite nanoparticles. These results allow us to reach a more comprehensive understanding of the stabilization and crystallization mechanism of ACC in the presence of additives and provide guidelines for controlling the polymorph selection and morphology of crystals during the crystallization of amorphous precursors.
{"title":"Stabilization and crystallization mechanism of amorphous calcium carbonate","authors":"Qihang Wang , Wenyang Huang , Jilin Wang , Fei Long , Zhengyi Fu , Jingjing Xie , Zhaoyong Zou","doi":"10.1016/j.jcis.2024.11.076","DOIUrl":"10.1016/j.jcis.2024.11.076","url":null,"abstract":"<div><div>Amorphous phases hold great promise in diverse applications and are widely used by organisms as precursors to produce biominerals with complex morphologies and excellent properties. However, the stabilization and crystallization mechanisms of amorphous phases are not fully understood, especially in the presence of additives. Here, using amorphous calcium carbonate (ACC) as the model system, we systematically investigate the crystallization pathways of amorphous phases in the presence of poly(Aspartic acid) (pAsp) with various chain lengths. Results show that pure ACC transforms into a mixture of calcite and vaterite via the typical dissolution–recrystallization mechanism and 3 % of Asp monomer exhibits negligible effect. However, pAsp with a chain length of only 10 strongly inhibits the aggregation-induced formation of vaterite spheres while slightly delaying the growth of calcite via classical ion-by-ion attachment, thus kinetically favoring the formation of calcite. Moreover, the inhibition effect of calcite growth from solution ions becomes more prominent with the increase of pAsp chain length or concentration, which significantly improves the stability of the amorphous phase and leads to crystallization of spherical or elongated calcite via the nonclassical particle attachment mechanism after pseudomorphic transformation of ACC into vaterite nanoparticles. These results allow us to reach a more comprehensive understanding of the stabilization and crystallization mechanism of ACC in the presence of additives and provide guidelines for controlling the polymorph selection and morphology of crystals during the crystallization of amorphous precursors.</div></div>","PeriodicalId":351,"journal":{"name":"Journal of Colloid and Interface Science","volume":"680 ","pages":"Pages 24-35"},"PeriodicalIF":9.4,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142646089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-13DOI: 10.1016/j.jcis.2024.11.032
Yan Zhu , Bo Liang , Jijia Zhu , Zhibin Gong , Xiping Gao , Dahu Yao , Jing Chen , Chang Lu , Xinchang Pang
Avoiding crosstalk between strain and temperature detection is crucial for bimodal hydrogel sensors, yet achieving high sensitivity for both parameters while maintaining signal decoupling remains a significant challenge. In this study, a bimodal sensor was developed by locally coating poly (3,4-ethylene dioxythiophene): polystyrene sulfonate (PEDOT: PSS) onto the hydrogel surface, creating distinct regions for strain and temperature detection. These regions form localized strain concentration zones and wrinkle structures, respectively. The localized strain concentration enhances the sensor’s sensitivity from 8.5 to 18.5. Additionally, the sensor demonstrates a low detection limit (0.2 %), a wide detection range (up to 1356 %), a fast response time, and excellent cyclic stability for strain measurements. The temperature detection region, leveraging the thermoelectric effect, improves the Seebeck coefficient of the PEDOT: PSS coating from 20 to 122.86 μVK−1 through de-doping and energy band modulation. Moreover, the temperature sensing of the PEDOT: PSS coating features good cyclic stability, a rapid response time, and versatile testing capabilities. This innovative structural design effectively decouples strain and temperature signals across a broad strain range (0–600 %). These sensors hold potential applications in human health monitoring and as electronic skin for flexible robotics.
{"title":"Hydrogel-based bimodal sensors for high-sensitivity independent detection of temperature and strain","authors":"Yan Zhu , Bo Liang , Jijia Zhu , Zhibin Gong , Xiping Gao , Dahu Yao , Jing Chen , Chang Lu , Xinchang Pang","doi":"10.1016/j.jcis.2024.11.032","DOIUrl":"10.1016/j.jcis.2024.11.032","url":null,"abstract":"<div><div>Avoiding crosstalk between strain and temperature detection is crucial for bimodal hydrogel sensors, yet achieving high sensitivity for both parameters while maintaining signal decoupling remains a significant challenge. In this study, a bimodal sensor was developed by locally coating poly (3,4-ethylene dioxythiophene): polystyrene sulfonate (PEDOT: PSS) onto the hydrogel surface, creating distinct regions for strain and temperature detection. These regions form localized strain concentration zones and wrinkle structures, respectively. The localized strain concentration enhances the sensor’s sensitivity from 8.5 to 18.5. Additionally, the sensor demonstrates a low detection limit (0.2 %), a wide detection range (up to 1356 %), a fast response time, and excellent cyclic stability for strain measurements. The temperature detection region, leveraging the thermoelectric effect, improves the Seebeck coefficient of the PEDOT: PSS coating from 20 to 122.86 μVK<sup>−1</sup> through de-doping and energy band modulation. Moreover, the temperature sensing of the PEDOT: PSS coating features good cyclic stability, a rapid response time, and versatile testing capabilities. This innovative structural design effectively decouples strain and temperature signals across a broad strain range (0–600 %). These sensors hold potential applications in human health monitoring and as electronic skin for flexible robotics.</div></div>","PeriodicalId":351,"journal":{"name":"Journal of Colloid and Interface Science","volume":"680 ","pages":"Pages 832-844"},"PeriodicalIF":9.4,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142638176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-13DOI: 10.1016/j.jcis.2024.11.079
Dilek Korcoban, Louisa Z Y Huang, Aaron Elbourne, Qi Li, Xiaoming Wen, Dehong Chen, Rachel A Caruso
Hypothesis: The small size of the nanoparticles used to obtain high surface area photocatalysts makes their removal from solution difficult. Producing photocatalysts on substrates would alleviate this limitation. Adding heterojunctions to photocatalysts, for example, TiO2/Ag, could improve photocatalytic performance due to Schottky junction formation and introduce antibacterial properties.
Experiments: TiO2 nanorod arrays were synthesised on a substrate via a hydrothermal approach, on which Ag nanoparticles were deposited using an electroless plating technique with varied deposition times and metal precursor concentrations. Photocatalytic performance was evaluated by monitoring Rhodamine B (RhB) degradation under ultraviolet light and antibacterial properties of the films tested using Methicillin-resistant Staphylococcus aureus.
Findings: The Ag nanoparticle content was controlled by the Ag deposition process. The TiO2/Ag nanorod array containing 6.6 atomic% Ag as nanoparticles of ∼ 25 nm in diameter degraded 88 % of the RhB in 6 h compared to 54 % degradation for bare TiO2 nanorods under the same reaction conditions. Decreased photoluminescence with heterojunction formation would indicate electron transfer from the TiO2 into the Ag nanoparticles, thereby reducing charge carrier recombination. The antibacterial test conducted in the dark revealed enhanced performance for the TiO2/Ag sample compared to TiO2 nanorods against Methicillin-resistant Staphylococcus aureus after 16 h exposure with a death rate of 84 %.
{"title":"Electroless Ag nanoparticle deposition on TiO<sub>2</sub> nanorod arrays, enhancing photocatalytic and antibacterial properties.","authors":"Dilek Korcoban, Louisa Z Y Huang, Aaron Elbourne, Qi Li, Xiaoming Wen, Dehong Chen, Rachel A Caruso","doi":"10.1016/j.jcis.2024.11.079","DOIUrl":"https://doi.org/10.1016/j.jcis.2024.11.079","url":null,"abstract":"<p><strong>Hypothesis: </strong>The small size of the nanoparticles used to obtain high surface area photocatalysts makes their removal from solution difficult. Producing photocatalysts on substrates would alleviate this limitation. Adding heterojunctions to photocatalysts, for example, TiO<sub>2</sub>/Ag, could improve photocatalytic performance due to Schottky junction formation and introduce antibacterial properties.</p><p><strong>Experiments: </strong>TiO<sub>2</sub> nanorod arrays were synthesised on a substrate via a hydrothermal approach, on which Ag nanoparticles were deposited using an electroless plating technique with varied deposition times and metal precursor concentrations. Photocatalytic performance was evaluated by monitoring Rhodamine B (RhB) degradation under ultraviolet light and antibacterial properties of the films tested using Methicillin-resistant Staphylococcus aureus.</p><p><strong>Findings: </strong>The Ag nanoparticle content was controlled by the Ag deposition process. The TiO<sub>2</sub>/Ag nanorod array containing 6.6 atomic% Ag as nanoparticles of ∼ 25 nm in diameter degraded 88 % of the RhB in 6 h compared to 54 % degradation for bare TiO<sub>2</sub> nanorods under the same reaction conditions. Decreased photoluminescence with heterojunction formation would indicate electron transfer from the TiO<sub>2</sub> into the Ag nanoparticles, thereby reducing charge carrier recombination. The antibacterial test conducted in the dark revealed enhanced performance for the TiO<sub>2</sub>/Ag sample compared to TiO<sub>2</sub> nanorods against Methicillin-resistant Staphylococcus aureus after 16 h exposure with a death rate of 84 %.</p>","PeriodicalId":351,"journal":{"name":"Journal of Colloid and Interface Science","volume":"680 Pt B","pages":"146-156"},"PeriodicalIF":9.4,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142674867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-12DOI: 10.1016/j.jcis.2024.11.068
Ricardo F. Alves , Rafael A. Raimundo , Bruno A.S.G. Lima , Francisco J.A. Loureiro , Duncan P. Fagg , Daniel A. Macedo , Uilame U. Gomes , Marco A. Morales
In this study, high-entropy spinel oxides (CoNiMnFeCr)3O4 were synthesized using a PVP-assisted sol–gel method, marking the first report of this approach for producing high-entropy oxides. This method provides new insights into morphology customization through precise temperature control during calcination. Samples were calcined at 800, 900, and 1000 °C, and structural, optical, and electrochemical characterizations were performed to evaluate the impact of synthesis conditions on the oxygen evolution reaction (OER) performance. X-ray diffraction (XRD) confirmed the formation of a single-phase spinel structure with face-centered cubic symmetry. UV–Vis spectroscopy revealed a band gap shift associated with calcination temperature, indicating subtle changes in electronic structure that can influence catalytic behavior. The S-HEO 800 sample exhibited the highest catalytic activity, achieving an overpotential of 316 mV at 10 mA cm−2. Electrochemical tests showed excellent short-term durability, with the electrodes maintaining stable performance for 24 h at 10 mA cm−2. Field emission gun scanning electron microscopy (FEGSEM) analysis revealed that particle size increased with calcination temperature, ranging from 96 nm (S-HEO 800) to 475 nm (S-HEO 1000). X-ray photoelectron spectroscopy (XPS) showed a higher concentration of Cr6+, Cr4+, and Ni3+ ions on the surface of S-HEO 800, correlating with its superior OER performance. Additionally, Raman and FT-IR spectra confirmed the formation of the spinel phase and provided insights into metal–oxygen bonding. Electrochemical impedance spectroscopy (EIS) results indicated that S-HEO 800 exhibited the lowest charge transfer resistance (Rct), further supporting its enhanced catalytic behavior. These findings demonstrate the potential of the PVP-assisted sol–gel method to produce customized high-entropy oxides with tunable morphology, making them promising candidates for energy conversion applications, particularly in water electrolysis.
{"title":"The effect of particle size on structural and catalysts for oxygen evolution reaction of (CoFeNiMnCr)3O4 prepared by controlled synthesis with polyvinylpyrrolidone (PVP)","authors":"Ricardo F. Alves , Rafael A. Raimundo , Bruno A.S.G. Lima , Francisco J.A. Loureiro , Duncan P. Fagg , Daniel A. Macedo , Uilame U. Gomes , Marco A. Morales","doi":"10.1016/j.jcis.2024.11.068","DOIUrl":"10.1016/j.jcis.2024.11.068","url":null,"abstract":"<div><div>In this study, high-entropy spinel oxides (CoNiMnFeCr)<sub>3</sub>O<sub>4</sub> were synthesized using a PVP-assisted sol–gel method, marking the first report of this approach for producing high-entropy oxides. This method provides new insights into morphology customization through precise temperature control during calcination. Samples were calcined at 800, 900, and 1000 °C, and structural, optical, and electrochemical characterizations were performed to evaluate the impact of synthesis conditions on the oxygen evolution reaction (OER) performance. X-ray diffraction (XRD) confirmed the formation of a single-phase spinel structure with face-centered cubic symmetry. UV–Vis spectroscopy revealed a band gap shift associated with calcination temperature, indicating subtle changes in electronic structure that can influence catalytic behavior. The S-HEO 800 sample exhibited the highest catalytic activity, achieving an overpotential of 316 mV at 10 mA cm<sup>−2</sup>. Electrochemical tests showed excellent short-term durability, with the electrodes maintaining stable performance for 24 h at 10 mA cm<sup>−2</sup>. Field emission gun scanning electron microscopy (FEGSEM) analysis revealed that particle size increased with calcination temperature, ranging from 96 nm (S-HEO 800) to 475 nm (S-HEO 1000). X-ray photoelectron spectroscopy (XPS) showed a higher concentration of Cr<sup>6+</sup>, Cr<sup>4+</sup>, and Ni<sup>3+</sup> ions on the surface of S-HEO 800, correlating with its superior OER performance. Additionally, Raman and FT-IR spectra confirmed the formation of the spinel phase and provided insights into metal–oxygen bonding. Electrochemical impedance spectroscopy (EIS) results indicated that S-HEO 800 exhibited the lowest charge transfer resistance (R<sub>ct</sub>), further supporting its enhanced catalytic behavior. These findings demonstrate the potential of the PVP-assisted sol–gel method to produce customized high-entropy oxides with tunable morphology, making them promising candidates for energy conversion applications, particularly in water electrolysis.</div></div>","PeriodicalId":351,"journal":{"name":"Journal of Colloid and Interface Science","volume":"680 ","pages":"Pages 818-831"},"PeriodicalIF":9.4,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142638180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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